new tester from ali? any good

[Wolf]

So does that mean its 99.9% accurate in terms of Capacity test based on the data you provided.

Accuracy is somewhat of a loose-fitting term in this scenario.
Accuracy refers to how close a measurement is to the true or accepted value.
In this case we use the accepted value of the mAh results from the SkyRC. which I have tested with a
CBA V Pro 100V - Computerized Battery Analyzer (The "Standard" in Accuracy and Precision)

CBA V - Computerized Battery Analyzer - West Mountain Radio

True constant current battery capacity test with results graphically displayed, constant power testing supported with Extended software upgrade. Discharge current is software and electronically regulated using a solid state switch and fan cooled electronic load. Test any type of battery; coin...

www.westmountainradio.com

and found the SkyRC to be within a ±1% margin. Meaning on a 2600mAh cell the differences are ± 26mAh.
That being said, the SkyRC became the accepted value.
Then comparing the Banber to the SkyRC the answer is yes, the Banber measurements are 99.97% of the "accepted" value.

And another thing @Wolf, the IR that you provided on the Banber Test, is it when the battery at full charge or not?

Technically all DC IR readings need to be at full charge. If you want to read an eye glazing over discussion and study on AC IR vs DC IR,
see this tread. https://secondlifestorage.com/index.php?threads/dc-ir-vs-ac-1kh-ir-measurements.9471/
I still stand by AC IR as the first initial test of a battery as it will indicate the SOH (State of Health) no matter what voltage and whether the cell is worth investing any time and energy into it.
If one wants to be successful in weeding out the good from the bad cells a 1kHz 4 wire AC tester such as the YR1035, RC3563 or similar is required.
Plenty of IR testers of that nature available. Save you $ and get one and you will be happy you did.
You can also view this thread. https://secondlifestorage.com/index.php?threads/ir-meter-recommendations.10361/

Wolf

 

[Fixerman]

Accuracy is somewhat of a loose-fitting term in this scenario.
Accuracy refers to how close a measurement is to the true or accepted value.
In this case we use the accepted value of the mAh results from the SkyRC. which I have tested with a
CBA V Pro 100V - Computerized Battery Analyzer (The "Standard" in Accuracy and Precision)

CBA V - Computerized Battery Analyzer - West Mountain Radio

True constant current battery capacity test with results graphically displayed, constant power testing supported with Extended software upgrade. Discharge current is software and electronically regulated using a solid state switch and fan cooled electronic load. Test any type of battery; coin...

www.westmountainradio.com

and found the SkyRC to be within a ±1% margin. Meaning on a 2600mAh cell the differences are ± 26mAh.
That being said, the SkyRC became the accepted value.
Then comparing the Banber to the SkyRC the answer is yes, the Banber measurements are 99.97% of the "accepted" value.

Technically all DC IR readings need to be at full charge. If you want to read an eye glazing over discussion and study on AC IR vs DC IR,
see this tread. https://secondlifestorage.com/index.php?threads/dc-ir-vs-ac-1kh-ir-measurements.9471/
I still stand by AC IR as the first initial test of a battery as it will indicate the SOH (State of Health) no matter what voltage and whether the cell is worth investing any time and energy into it.
If one wants to be successful in weeding out the good from the bad cells a 1kHz 4 wire AC tester such as the YR1035, RC3563 or similar is required.
Plenty of IR testers of that nature available. Save you $ and get one and you will be happy you did.
You can also view this thread. https://secondlifestorage.com/index.php?threads/ir-meter-recommendations.10361/

Wolf

Thanks for the info wolf

 

[italianuser]

Accuracy refers to how close a measurement is to the true or accepted value.

We should also consider the accuracy of the charging/discharging current (same for the voltage measurements the devices does).

If I do CDC cycle at 500mAh I'll obtain different results compared to a 1000mAh CDC or... a 975 - 1026mAh range cycle

 

[Fixerman]

We should also consider the accuracy of the charging/discharging current (same for the voltage measurements the devices does).

If I do CDC cycle at 500mAh I'll obtain different results compared to a 1000mAh CDC or... a 975 - 1026mAh range cycle

My charging and discharging are at 900mA but sometimes since I got a cheap cable that I'm using at the other charging port it just gives 700mA if 2 batteries are placed.

 

[Wolf]

If I do CDC cycle at 500mAh I'll obtain different results compared to a 1000mAh CDC or... a 975 - 1026mAh range cycle

Technically a 2600mAh cell going through a C/D/C cycle at 500mA should have the same capacity results with a 1000mA C/D/C cycle.
Consider the cell a gas tank. You fill it up with 2.6 liters you should expect a return of 2.6 liters (less some minor evaporation /spillage) no matter if you are driving 50 kph or 100kph.

However as a cell ages the voltage drop under a load will increase so in essence if the discharge cutoff is say 3.0V that voltage would be reached sooner with a 1000mA load giving us the lower results of capacity. A better method of actual capacity measurement at any load would be a mA cutoff value at the cutoff voltage(3.0V) of say 100mA. That would equalise the actual mAh capacity of the cell no matter if you draw 10A 1A or .5A.
The reasonably priced (cheap) under $100 charger/analyzers' we have in our possession (OPUS, LiitoKala, Vapecell, XTAR, etc.) are very rudimentary in their programing so don't expect even results at different C/D/C rates.
Now the SkyRC and the CBA V Pro are capable of manipulating all aspects of a discharge cycle and capable of actual mAh results utilizing a CC to CV (constant Current to constant Voltage) switchover. So when our 3.0V cutoff is reached under CC we switch over to CV to maintain the 3.0V and now we no longer draw 1000mA but reduce the draw (as voltage allows) slowly to 100mA giving us the actual mAh capacity of the cell.
For the SkyRC the same is true for the charge cycle. Many cell manufactures list the mA cutoff value where the CV 4.2V charge should cut off at.
So if I want both precision and accuracy I go to my CBA V Pro, SkyRC and Megacell Charger Pro. All of which have been tested to be true and accurate to the accepted value.

Wolf

PS take note how mA and mAh are used.
mA = Actual current at time of reading.
mAh = Total accumulation of mA over time I.E. 1000mA X 2.6hrs =2600mAh

 

[GLB18]

Accuracy is somewhat of a loose-fitting term in this scenario.
Accuracy refers to how close a measurement is to the true or accepted value.
In this case we use the accepted value of the mAh results from the SkyRC. which I have tested with a
CBA V Pro 100V - Computerized Battery Analyzer (The "Standard" in Accuracy and Precision)

CBA V - Computerized Battery Analyzer - West Mountain Radio

True constant current battery capacity test with results graphically displayed, constant power testing supported with Extended software upgrade. Discharge current is software and electronically regulated using a solid state switch and fan cooled electronic load. Test any type of battery; coin...

www.westmountainradio.com

and found the SkyRC to be within a ±1% margin. Meaning on a 2600mAh cell the differences are ± 26mAh.
That being said, the SkyRC became the accepted value.
Then comparing the Banber to the SkyRC the answer is yes, the Banber measurements are 99.97% of the "accepted" value.

Hello all
If it's of any interest, I've had three 2x4 slot versions of these “Banber” chargers for some time now. I've also calibrated them against my SkyRC MC3000, and here are the results for one of them (the 2 others are similar).
I used 4 cells of 2 types, 1200 mAh and 3000 mAh almost new, averaging 3 measurements for each slot.
The results are almost identical to Wolf's.